jcb JS300 Service Manual page 889

Section E - Hydraulics
Cushion Valve
Operation
Cushioned Mode - Hand Controller Moved from Dipper In to Neutral
C D
K
A B
Z
T
R
S
A409240-C1
Fig 5. Cushioned Mode - Hand Controller Moved from Dipper In to Neutral
When the hand controller is released, the left hand inner
and the outer spools move over to the left, back into the
neutral position. Pilot return oil from the control valve
enters via port C, then passes through the restricted orifice
Z through the centre of the inner spool. Due to this
restrictive effect, the dipper control spool in the main
control valve returns slower than normal to the neutral/stop
K Fig 5. ( T E-228)
position.
Anti Cavitation
Anti cavitation oil is supplied from the T port on the hand
controller, through port B, through the centre of the right
hand spool and gallery K, via port D to the main control
valve.
E-228 9813/5100-1 E-228